Social Media is integrated deeply into the Windows Phone experience in WP7, as will be for WP8. In fact, Microsoft have developed their own Facebook and Twitter apps built into the operating system that also syncs with other official Microsoft apps.
Seeing as the Microsoft / Facebook relationship is strong, we suspect a similar approach may be taken with Instagram. This means the Instagram Windows Phone app will be specifically built by Microsoft (with the assistance of Instagram and Facebook staff).
Here is the video, can you spot it?